File:Gullies on crater wall.jpg
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Summary
editDescriptionGullies on crater wall.jpg |
English: Gullies in crater. NASA wrote the following caption for this image of gullies: The banked, sinuous shape of the gully channels suggest that water was involved in their formation. The source of this water however is a subject of debate. Hypotheses include melting of snow or near-surface ground ice.
Other features also suggest the past (and possibly present) presence of snow or ground ice in this region. For example, the “mantle” deposit on the crater wall displays polygonal fractures. Polygons on Earth are associated with periglacial activity. This refers to processes that occur from the presence of ground ice, which interacts with surface and subsurface materials, as well as the Martian atmosphere as a function of climate and seasons). The mantle itself may be the remains of a dusty snowpack deposited in Mars’ recent past. At the base of the mantle are fractures associated with the slumping of these deposits under their own weight and Martian gravity. The largest gullies cut into these mantling deposits, and in some places obscure the underlying fractures at the base of the crater wall. This indicates that the largest gullies are younger than both the mantle and the fractures. Written by: Livio Tornabene, Tanya Harrison, Elizabeth Silber, and Kayle Hansen (narration: Tre Gibbs) (29 July 2015) |
Date | |
Source | https://www.uahirise.org/ESP_041866_2290 |
Author | Jim Secosky suggested NASA take a picture of this spot under the HiWish program. The image credit should read: NASA/JPL-Caltech/UArizona/. |
Location on Mars | 48° 26′ 56.4″ N, 89° 13′ 26.4″ E | View this and other nearby images on: Google Maps | 48.449000; 89.224000 |
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Licensing
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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current | 14:24, 17 November 2023 | 1,668 × 887 (506 KB) | Jimmarsmars (talk | contribs) | Uploaded a work by Jim Secosky suggested NASA take a picture of this spot under the HiWish program. The image credit should read: NASA/JPL-Caltech/UArizona/. from https://www.uahirise.org/ESP_041866_2290 with UploadWizard |
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